添加（0108.将有序数组转换为二叉搜索树.md）：增加typescript版本

problems/0108.将有序数组转换为二叉搜索树.md

@@ -251,7 +251,7 @@ class Solution {
 		return root;
 	}
 }
-``` 
+```
 
 迭代: 左闭右闭 [left,right]
 ```java
@@ -373,7 +373,24 @@ var sortedArrayToBST = function (nums) {
 };
 ```
 
+## TypeScript
+
+```typescript
+function sortedArrayToBST(nums: number[]): TreeNode | null {
+    function recur(nums: number[], left: number, right: number): TreeNode | null {
+        if (left > right) return null;
+        let mid: number = Math.floor((left + right) / 2);
+        const root: TreeNode = new TreeNode(nums[mid]);
+        root.left = recur(nums, left, mid - 1);
+        root.right = recur(nums, mid + 1, right);
+        return root;
+    }
+    return recur(nums, 0, nums.length - 1);
+};
+```
+
 ## C
+
 递归
 ```c
 struct TreeNode* traversal(int* nums, int left, int right) {